Features

Evaporant metals do not wet alumina, resulting in the melt forming a "sphere" that acts as a point source

Heater resistance does not change throughout the deposition since evaporant does not touch the underlying heater material

Works well when thermally evaporating gold.

Because the alumina increases the thermal resistance between heater and evaporant, coated sources require 30–50% more power to achieve the same evaporation rate as an identical but uncoated basket heater. Another important difference is the thermal lag created by the alumina coating.

Any measurement of temperature in the region of the melt will not be the "equilibrium" temperature unless the power is raised very slowly. Typically, users do not have time for this slow rise and put excess power into the heater until the right evaporation rate is reached. Unfortunately, unless this excess power is then quickly reduced, the melt temperature will quickly rise above the optimum rate value.

NOTE: Coated heaters can have a longer usable life than non-coated sources when using care in handling and operation. The alumina is semiconductor grade and is applied by a plasma spray technique to a thickness of 0.005". The ends of the basket heater are unsprayed to allow successful connection to the power supply clamps. Coated baskets should not be used where the heater temperature must exceed 1475° C to achieve the required evaporation rate.

Don’t forget to order your evaporation materials.

Pellets/Pieces

Gold Pellets

Dimensional Drawings

AluminaCoatedBasketHeaters

Drawing:AluminaCoatedBasketHeaters

Evaporation Sources FAQ

Click here for answers to some of the most common questions we are asked.

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